---
title: Boo Who
---
# Boo Who
---
## Problem Explanation
This program is very simple, the trick is to understand what a boolean primitive is. The programs requires a true or false answer.
#### Relevant Links
* Boolean
---
## Hints
### Hint 1
You will need to check for the type of the parameter to see if it is a boolean.
### Hint 2
To check for the type of a parameter, you can use `typeof`.
### Hint 3
Since you must return true or false you can use if statements or just have it return the boolean used for the if statement.
---
## Solutions
Solution 1 (Click to Show/Hide)
```javascript
function booWho(bool) {
return typeof bool === "boolean";
}
// test here
booWho(null);
```
#### Code Explanation
* Uses the operator `typeof` to check if the variable is a boolean. If it is, it will return `true`. Otherwise, if it is any other type it will return `false`.
#### Relevant Links
* typeof